Some organic compounds were tested as corrosion inhibitors for aluminum alloy 6063 (Al 6063, UNS A96063) in a deaerated carbonate solution using the electrochemical polarization method. The compounds studied were thiourea (TOR), diorthoaminodiphenyldisulfane (DOAPD), and benzotriazole (BTA). Results showed DOAPD was the best inhibitor. Its inhibition efficiency (E%) reaches a maximum value of 95.8% at 10–2 M. Polarization measurements indicated DOAPD acted as a cathodic and anodic (mixed) inhibitor without changing the mechanism of the water evolution reaction. DOAPD was adsorbed on the aluminum surface according to a Langmuir isotherm model. The other compounds tested had no effect on pitting corrosion of Al 6063.

Subject
Chemical compounds, Water, Aluminum, Adsorption, Anodic polarization curves, Cathodic polarization curves, Activation energy, Electrochemical parameters, Solutions, Metals, Corrosion inhibitors, Aluminum alloys, Electrodes
Keywords:
adsorption, Al 6063, aluminum, carbonate solutions, cathodic inhibitor, inhibitors, organic inhibitors, passivation, pitting
NACE International
1995
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